COE2001 Exam 1 Terms - Forces

What are the classifcations of force?

contact and body

Contact Force

produced by direct physical contact.

Body Force

a force generated by the position of a body within a force field

What are the applications of force?

concentrated and distributed

Concentrated Force

a force applied to an area with very small dimensions

Distributed Force

a contact force that is applied over a finite area

What are the locations of force?

external and internal

External Force

change motion or develop reactions

Internal Force

cause deformations

Force Characteristics

magnitude, direction, point of application, and units

What notation is this 86.6i+ 50 j?

vector notation

Law of Transmissibility

any force may be applied at any point on the loa without altering the resultant effects.

Concurrent Force Systems

LOA’s intersect at a point, can replace all forces with one; translation

Non-Concurrent Force Systems

LOA’s don’t’ intersect; translation and rotation

Moment of a Force

a way to measure the tendency of a point to cause an object to rotate about a point; perpendicular distance b/w LOA of force and axis at point O.

Varignon’s Theorem

no matter where forces are acting along the LOA, all forces will have the same magnitude of the resulting moment.

Characteristics of Two Couple Forces

equal magnitude, opposite direction, parallel LOA, non-colinear

M = F1d = F2d is an example of?

the moment of a couple

Steps to solving a resultant force problems

determine a coordinate system (orthogonal)

calculate components (x,y) of each force

combine components to find components of the resultant

find magnitude of the resultant

calculate the resultant direction